V
CONTENTS
4.19.5 Buzzer control (Pr. 990)............................................................................................................. 229
4.19.6 PU contrast adjustment (Pr. 991) .............................................................................................. 229
4.20 Parameter clear/ All parameter clear ............................................ 230
4.21 Initial value change list.................................................................. 231
4.22 Check and clear of the faults history ............................................ 232
5 TROUBLESHOOTING 235
5.1 Reset method of protective function .............................................. 236
5.2 List of fault or alarm indications..................................................... 237
5.3 Causes and corrective actions ....................................................... 238
5.4 Correspondences between digital and actual characters ............. 248
5.5 Check first when you have a trouble .............................................. 249
5.5.1 Motor does not start.................................................................................................................... 249
5.5.2 Motor or machine is making abnormal acoustic noise................................................................ 250
5.5.3 Drive unit generates abnormal noise.......................................................................................... 251
5.5.4 Motor generates heat abnormally............................................................................................... 251
5.5.5 Motor rotates in the opposite direction ....................................................................................... 251
5.5.6 Speed greatly differs from the setting......................................................................................... 251
5.5.7 Acceleration/deceleration is not smooth..................................................................................... 252
5.5.8 Speed varies during operation.................................................................................................... 252
5.5.9 Operation mode is not changed properly ................................................................................... 253
5.5.10 Operation panel display is not operating .................................................................................... 253
5.5.11 Motor current is too large............................................................................................................ 253
5.5.12 Speed does not accelerate......................................................................................................... 254
5.5.13 Unable to write parameter setting............................................................................................... 254
6 PRECAUTIONS FOR MAINTENANCE AND INSPECTION 255
6.1 Inspection items.............................................................................. 256
6.1.1 Daily inspection .......................................................................................................................... 256
6.1.2 Periodic inspection ..................................................................................................................... 256
6.1.3 Daily and periodic inspection...................................................................................................... 257
6.1.4 Display of the life of the drive unit parts...................................................................................... 258
6.1.5 Checking the inverter and converter modules ............................................................................ 258
6.1.6 Cleaning ..................................................................................................................................... 259
6.1.7 Replacement of parts ................................................................................................................. 259
6.2 Measurement of main circuit voltages, currents and powers .......262
6.2.1 Measurement of powers ............................................................................................................. 264
